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CO2咸水层封存被广泛认为是一种具有大规模温室气体减排潜力的地学前缘技术。选取中国第一个全流程CCS项目为研究背景,结合工程实际情况,选取鄂尔多斯盆地为具体研究对象,提取相关参数,建立相应的地质模型,通过数值模拟研究咸水层多层统注时CO2在咸水中的主要封存机制、CO2在地层中的运移分布特征及其与注入能力的关系,并观测由于CO2注入引起的地层压力、CO2摩尔分数、酸碱度等的变化情况,为方案的进一步优化奠定基础。研究表明,CO2注入咸水层后,大部分进入储层上部,且注入能力越大时,注入的层位越多,注入量越大;CO2在咸水层中的存在形式有自由态、束缚态和溶解态。所有探索性研究的目的是给示范性项目的未来提供一个良好的基础优化方案。
CO2 Seawater Sequestration is widely recognized as a geospatial frontier with the potential for large-scale GHG mitigation. Taking the first CCS project in China as the research background, taking Ordos Basin as an example, the relevant parameters were extracted and the corresponding geological models were established. Based on the numerical simulation, The main sequestration mechanism in saltwater, the migration and distribution of CO2 in the strata and its relationship with the injection ability, and observing the changes of formation pressure, CO2 mole fraction, pH and other factors caused by CO2 injection, which laid the foundation for the further optimization of the scheme basis. The results show that most of CO2 enters the upper part of the aquifer when it is injected into the saline water layer, and the larger the injection capacity, the more the injection layer and the larger the injection amount. The CO2 exists in the saline layer in a free state, State and dissolved state. The purpose of all exploratory research is to provide a good basis for optimizing the future of demonstration projects.